Gaya APA

Simpson, D, M. (1996). Weed science Vol. 44 No. 2 April - June 1996 . Madison, Wisconsin, AS: Weed Sciences Society Of America.

Gaya MLA

Simpson, David, M.. "Weed science Vol. 44 No. 2 April - June 1996". Madison, Wisconsin, AS: Weed Sciences Society Of America, 1996. Text.